[cinder][dev] support-revert-to-any-snapshot

To cinder driver developers:
* https://blueprints.launchpad.net/cinder/+spec/support-revert-to-any-snapshot
In relation to the blueprint above. I am wondering if there are any drivers that whose later snapshots will not be valid after a revert to an snapshot that is NOT the last in the series
Vol1
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Mon Tue Wed Thu Fri
\ \ \ \ \
S1 -------- S2 ---------S3 -------- S4 ---------S5
If on Fri, I was to revert back to Tuesday's Snapshot S2, would S3, S4 and S5 still be usable Snapshots?
Vol1
\
-----------------------------------------------------
Mon Tue Wed Thu Fri
\ \ \ \ \
S1 -------- S2 ---------S3 -------- S4 ---------S5
Thank you,
Helen
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